FortiOS performs several routing checks before standard forwarding-table processing. The FortiOS 7.6 Administrator Study Guide describes the sequence explicitly. FortiGate first evaluates regular policy routes. If no applicable policy route forwards the packet, FortiGate evaluates Internet Service Database routes, followed by configured SD-WAN rules.
Only after those policy-routing mechanisms have been evaluated does FortiGate perform the standard forwarding information base (FIB) lookup. Static and dynamically learned routes, including BGP routes, are represented in this normal routing stage.
Consequently, among the available choices, the correct ordering is policy routes, ISDB routes, SD-WAN rules, and then static routes through the FIB. Options A and B incorrectly place SD-WAN before ISDB or policy routing, while C incorrectly places SD-WAN ahead of the regular policy-routing stages. Therefore, D is correct.
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